m. khorasani

The present study aims to explore the impact of different types of powder on the latex dispersibility index and pigment binding capacity in Acrylic-Styrene latexes. The methodology employed in this study involves investigating the latex dispersibility index by monitoring the Brookfield viscosity of pre-wetted powder when added to latex. Furthermore, the pigment binding capacity of the powders was evaluated through the wet scrub resistance of the latex paint. The findings from this study emphasize the importance of the size, shape, hydrophobicity, and hydrophilicity of powders in influencing the dispersibility of latex. Additionally, the physical and chemical properties of the powder also influence the binding strength between the powder and latex in the dried film. The implications of this study are discussed in terms of the ability to predict the powder-latex dispersion behavior using the viscosity-latex content curve for each type of powder. The results revealed that the maximum viscosity for the latex mixtures containing talc powder and calcium carbonate occurs at the amount of latex lower than 5 g. In contrast, the mixtures with titanium dioxide powder reach their maximum viscosity in the presence of higher than 10 g latex. Overall, this paper provides valuable insights into the characteristics of powders and their impact on the latex dispersibility index and pigment binding capacity in Acrylic-Styrene-based latexes.

The purpose of writing educational works is to educate and teach moral issues and points to improve the morals of the audience, I am a researcher related to educational literature and political thought in Iran, focusing on the Islamic period, it directly refers the researcher to a collection of works that They have been written under the title of policy in different periods of history. Writing political letters in this era is the result of the accumulation of a cultural intellectual duality, which on the one hand is a reflection of the political thought in ancient Iran and on the other hand is mixed with traces of Islamic political thought. The Siastname, Qaboosnameh, Nasihat al-Moluk and Dastur al-Moluk, all of which were written in the fifth century of Hijri, are guidelines containing practical instructions for the guidance and guidance of courtiers in political affairs from the highest level, i.e. the king, to the lowest level, i.e. officials and agents. In this research, the linguistic similarities between Dastar al-Moluk, Siasatnameh, Qaboosnameh, and Nasihat al-Moluk of Ghazali are discussed.

This article, using a descriptive and analytical method, tries to examine the linguistic similarities of these four texts in the two fields of teachings related to politics and statecraft and individual ethics, and to answer the question whether there is a difference between these teachings. Is there a difference in the four mentioned texts?

The findings indicate that the texts of the four mentioned works, in terms of the central narrative, adverbs, marked forms, division and explanation, emphatic forms, repetition, synonyms, contrast/paradox, simile of numbers and non-use of Balance and Saj’ have many similarities.

The results show that features such as simplicity and fluency, reference to verses and hadiths, central story, repetition and synonymy, contradictory constructions, comparison, use of superlative adjectives, use of special present tenses and literary arrays such as Allegory, division and explanation after ambiguity in them as common linguistic features have become generalizable features in these conventions.

The inclusion of Jung and ships in the poems of different poets, some of whom are unknown, in addition to placing these works in the ranks of divans and tazkirehs and the history of literature, shows the literary taste of the people at the time of their creation. For this reason, the poetic vessels are considered as important sources of correction of the court of poets. One of these wars is the War of Poems No. 3423 of the National Library of France, which was created by many writers between the 9th and 13th centuries. In this research, the most important features of this Jung have been investigated.

The current research is a theoretical research that was conducted in a documentary-comparative way. The studied society of Jang Poems Manuscript No. 3423 of the National Library of France in Paris, is the most reliable divans of poems of poets whose poems are included in this work, as well as references and history of printed literature. This means that in order to achieve more findings that express the literary value of this Jung, a comparative comparison has been made between the verses of this war and divans, the history of literature and tazkira.

More than eight scribes were involved in compiling this Jung. Examining the poems in this work shows that almost one-third of the poems of this war are new, and the new selections, the introduction of unknown and lesser-known poets, and the disambiguation and correction of some verses have added to the value of this collection. The poems in this Jung show the poetic interest of the writers of this covenant and the level of fame of the poets in the 9th century.

The collection of this Jung by many writers has increased the amount of new poems. In addition, the analysis of the poems of this Jung shows that the poems of famous poets such as Hafez, Maulvi, Saadi, Sanai, Anuri, and Khaqani were still liked by the people in the 9th century. In addition, the poems of Ibn Yamin Faryoumdi and Qazi Nizamuddin Isfahani, who are late poets of this Jung, enjoyed considerable fame in the 9th century. New selections from Diwan of early and late poets in this work have increased the semantic richness and removed ambiguity and corrected some verses in Diwans and printed notes.

This paper aimed to investigate the effect of the minimum film formation temperature (MFFT) of acrylic-styrene latexes (ASL) on the durability, physical, and mechanical characteristics of latex-modified concretes (LMCs). LMCs were designed and manufactured incorporating three ASLs with different MFFTs, namely 0, 8, and 25 °C (Water/Cement mass ratio=0.445 and latex/water mass ratio=0.05). Water absorption (WA), rapid chloride ion migration, carbonation, compressive-splitting tensile strength, and scanning electron microscopy (SEM) were employed to study LMCs properties. The performance of LMCs was found to be dependent on the MFFT of the latexes strongly. The results revealed that LMCs containing ASL with lower MFFT compared to ambient temperature (MFFT<25 °C) had a lower slump, compressive and tensile strength, and higher WA, chloride ion, and CO2 penetration due to the higher film formation rate of latexes on the non-hydrated cement particles and the decreased final hydration degree. Furthermore, it was indicated that chloride penetration, water adsorption, and tensile strength of LMCs containing latexes with high MFFT (MFFT>25 °C) decreased by 14 %, 10 and 20 % compared to the conventional concrete, respectively. Such a chloride penetration reduction is a great achievement. Accordingly, carboxylated alkaline ASLs with high MFFT can be a promising candidate for preparing the LMCs, which can be applied in reinforced concrete in corrosive conditions.

The identity of a person gives that person some attributes making him/her distinguishable among other people. This study aimed at analyzing the youth’s identities and studying the differences between their identities in real and virtual worlds in Southern Sarroud sub-district of Boyer-Ahmad County in Iran. The required data were collected through field methods (questionnaire) and document methods. The statistical society of the research included the youth living in this sub-district. Based on the Cochran formula, 376 people in 20 rural settlements were selected using purposive and multi-stage cluster sampling and then, they were tested. The studied dimensions in this research included religious, family, modern and ethnic identities. The results showed that there was a self-disagreement of  between the real and virtual identities of the youth while the maximum and minimum self-disagreements were related to the family identity and modern identity with average rates of 1.85 and -0.24, respectively; that is, the average family identity in the real world is more than that in the virtual world and the average modern identity in the real world is less than that in the virtual world. Also, the results of the Pearson test indicated that there were significant relationships between all the dimensions of the identity in the real and virtual worlds while in the dimensions of religious and family identities, the correlation was negative and in the dimensions of modern and ethnic identities, the correlation was positive.

Solvent and water-based polyester resins are used in many different applications; one of them is the automotive paints' primary layers. In this research, a water-reducible polyester resin curable with melamine was synthesized (PS1). This resin was cured for 30 minutes with a temperature of 120 ̊C. The final product is a water-reducible resin, which was synthesized, neutralized and diluted with water, and consequently, a milky white water-based dispersion was obtained. The indicating peaks of the Fourier Transform Infrared (FTIR) test alongside the results of the Differential Scanning Calorimetry (DSC) test were proof to confirm the control over the polyester resin synthesis. To evaluate the anti-corrosion and adhesion properties, the synthesized resin in a full-coating system was compared with a commercial resin. The pull-off test was used to check the adhesion strengths. PS1 (polyester resin) coating system revealed an adhesion strength value of 2.05 MPa compared to 2.51 MPa for RW100. Digital images taken from the samples' surface in the salt spray test showed that after one month in a corrosive environment, synthesized resin has better anti-corrosion resistance than commercial sample. Electrochemical Impedance Spectroscopy (EIS) test indicated that after 15 weeks of immersion in the 3.5% sodium chloride electrolyte solution, the synthesized resin system indicated an impedance resistance at low frequency of 4.05 ×109 ohm.cm2, which is more than the Daotan VTW 1225 (2.75 ×106 ohm.cm2).

Today, changing lifestyles, social relations and the advancement of technology causes fear, threats and concerns of different groups in society, especially students. Adverse impact of Anxiety on the efficacy and talents, personality and social identity formation of students, threat to achieve the goals of academic achievement and mental health. The present study was conducted to determine level of anxiety and some of their demographic correlates in the Alborz University of Medical Sciences in 1390.

This study is a descriptive cross sectional study. The study population included all students of the Alborz university. 305 students were selected by stratified random sampling method. The data collection instrument was a demographic questionnaire and standardized Spielberger Anxiety Inventory. Data were analyzed using descriptive and inferential statistical methods.

Based on our results, 64 percent of students were anxious. Anxiety levels were significantly higher in men than women (p=0.049). The level of anxiety and interesting in medical course (p<0.001), non-academic study (p=0.007) and a major physical illness (p=0.009) had significant correlations with together.

Results showed a high percentage of students anxious. Regarding the relation between anxiety and other problems such as depression and other disorders including failure in educational function, social relationships and lifestyle, Training courses on coping skills for anxiety and stress as well as consulting services and further guidance is recommended for them.